code: def prepare_environment_fixture():
      if not os.path.exists(CACHE_FOLDER):
          os.makedirs(CACHE_FOLDER)
      else:
          n = 0
          while os.path.exists(CACHE_FOLDER + str(n)):
              n += 1
      print("{} is checked.".format(CACHE_FOLDER))
  
file_path: nnabla/src/nbla_utils/test/test_npy_files.py
imports: import pytest
  import numpy
  import zlib
  import csv
  import os
  from collections import OrderedDict
label_desc: Use image node_id 4 for calling a global function with example usage: prepare_environment_fixture() without return types